Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e9381e356da2d8…

MALICIOUS

PDF

67.4 KB Created: 2020-07-26 20:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2edcd02bfb95650be4d08b2c3227a1f SHA-1: 6fcd8314acc68f35fc5f1d29f3b96b2ad23ae9c1 SHA-256: 54e9381e356da2d8dc2a28d294e712de2f01da65698f303d646748fa37e0bf2f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains, forming a link farm. One critical heuristic identified a link to a known malicious redirector (ttraff.cc), indicating a malicious intent to direct users to harmful content. The ML classifier strongly supports the malicious nature of this PDF. The document body is heavily obfuscated and appears to be junk data, but the presence of the redirector link and the link farm structure are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=mathematical+expectation+examples+pdf
    • http://files.jyfit.com/uploads/1/3/1/0/131070317/c6a537cc809a5ec.pdf
    • http://files.lvapa.com/uploads/1/3/0/7/130775838/nifize_kotuko_xedudimuf.pdf
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdf
    • http://files.catherinehessart.com/uploads/1/3/2/3/132303270/8867472.pdf
    • http://files.discoveryelectricbikes.com/uploads/1/3/2/7/132740375/4424646.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/15160726795.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/fatikepikojivigobukoseni.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3981/files/79166339062.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/namumasababewarulagexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/tuvosoziseso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/18046973101.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/vevawotibututa.pdf
    • https://cdn.shopify.com/s/files/1/0436/4143/8366/files/99054356627.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/mugiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/20444928298.pdf
    • https://cdn.shopify.com/s/files/1/0430/8864/2197/files/wozetomogolumofapipor.pdf
    • https://cdn.shopify.com/s/files/1/0430/9821/0461/files/33200582126.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3541/files/17652965930.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0430/8572/5857/files/namumasababewaru

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b413.bin
e46e073489cde9dd29ac788cd8822cdbc47df963f2522a560f6303ebfa2ed301		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 5160 bytes
font_01_sfnt_off0000c57e.bin
1bdd1009032d7ee133df122d840b33417d7c637fe73ae9accf14b055edc47524		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC57E 10408 bytes
font_02_sfnt_off0000e952.bin
64729c1bbeaaee2c3d5a98a1270de8952fd12c4910f48b4340db1a6ff78e921a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 16420 bytes

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